It seems that Blizzard itself has leaked the exact release date of WoW: Wrath of the Lich King Classic

Thanks to a mistake made by Blizzard, we now know the exact release date of Wrath of the Lich King Classic for World of Warcratf. 

The WoWHead site editors noticed the fail. The developers of the classic WoW have updated game page and added an image with the caption: "The Lich King returns September 26, 2022". This mistake was very quickly removed from the site.

We will remind, for the first time the Wrath of the Lich King Classic add-on was demonstrated during a large broadcast, which was entirely devoted to World of Warcraft. Until now, the DLC did not have an official release date - Blizzard was going to release it before the end of this year. Dragonflight addition is also under development.